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## Why Pending model input was split across `Session`, `TurnState`, and the agent mailbox. That made it easy for new paths to manage queued user input or mailbox delivery outside the intended ownership boundary. This PR consolidates the model-facing input lifecycle behind the session input queue so turn-local pending input, next-turn queued items, and mailbox delivery coordination are owned in one place. ## What Changed - Added `session/input_queue.rs` to own pending input queues and mailbox delivery coordination. - Removed the standalone `agent/mailbox.rs` channel wrapper and store mailbox items directly in the input queue. - Moved pending-input mutations off `TurnState`; `TurnState` now exposes the queue-owned storage directly for now. - Routed abort cleanup, mailbox delivery phase changes, next-turn queued items, and active-turn pending input through `InputQueue`. - Boxed stack-heavy agent resume/fork startup futures that the refactor pushed over the default test stack. - Updated session, task, goal, stream-event, and multi-agent call sites and tests to use the new queue ownership. ## Verification - `cargo test -p codex-core --lib agent::control::tests` - `cargo test -p codex-core --lib agent::control::tests::resume_closed_child_reopens_open_descendants -- --exact` - `cargo test -p codex-core --lib agent::control::tests::spawn_agent_fork_last_n_turns_keeps_only_recent_turns -- --exact` - `cargo test -p codex-core --lib agent::control::tests::resume_thread_subagent_restores_stored_nickname_and_role -- --exact` - `cargo test -p codex-core` was also run; it completed with 1814 passed, 4 ignored, and one timeout in `agent::control::tests::resume_thread_subagent_restores_stored_nickname_and_role`, which passed when rerun in isolation.